diff --git a/libs/styles/styles.css b/libs/styles/styles.css
index 7badedc0fc..7413807321 100644
--- a/libs/styles/styles.css
+++ b/libs/styles/styles.css
@@ -127,7 +127,7 @@
   --icon-size-s: 32px;
   --icon-size-xs: 24px;
   --icon-size-xxs: 16px;
-  
+
   /* z-index */
   --above-all: 9000; /* Used for page tools that overlay page content */
 }
@@ -765,6 +765,10 @@ h6 {
   line-height: var(--type-heading-xs-lh);
 }
 
+:is(h1, h2, h3, h4, h5, h6, p):lang(ja) {
+  line-break: strict;
+}
+
 /* Links */
 a.auto-block,
 a.fragment {